* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: white;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 450px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-box {
    background-color: #fff;
    border-radius: 30px;
    padding: 50px 40px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.login-header {
    text-align: center;
    margin-bottom: 45px;
}

.login-header h1 {
    font-size: 26px;
    font-weight: bold;
    color: #333;
    margin-bottom: 15px;
    line-height: 1.4;
}

.login-header h2 {
    font-size: 22px;
    font-weight: normal;
    color: #666;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.login-input {
    width: 100%;
    padding: 18px 22px;
    font-size: 17px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    outline: none;
    transition: all 0.3s;
    background-color: #fafafa;
}

.login-input::placeholder {
    color: #bbb;
    font-size: 16px;
}

.login-input:focus {
    border-color: #2196F3;
    background-color: #fff;
    box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.1);
}

.login-btn {
    width: 100%;
    padding: 18px;
    font-size: 20px;
    font-weight: bold;
    color: #fff;
    background: linear-gradient(135deg, #2196F3 0%, #1976D2 100%);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    margin-top: 15px;
    transition: all 0.3s;
    box-shadow: 0 6px 20px rgba(33, 150, 243, 0.4);
}

.login-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(33, 150, 243, 0.5);
}

.login-btn:active {
    transform: translateY(-1px);
}

.login-tip {
    text-align: center;
    font-size: 14px;
    color: #999;
    margin-top: 20px;
    line-height: 1.8;
}

/* 响应式设计 */
@media (max-width: 500px) {
    .login-box {
        padding: 40px 30px;
        border-radius: 25px;
    }

    .login-header h1 {
        font-size: 22px;
    }

    .login-header h2 {
        font-size: 18px;
    }

    .login-input {
        padding: 16px 20px;
        font-size: 16px;
    }

    .login-btn {
        padding: 16px;
        font-size: 18px;
    }
}